31.4: A Preliminary Study on the Frame Glare by Reflected Light for its Allowable Level and Evaluation Method

2011 ◽  
Vol 42 (1) ◽  
pp. 420-423
Author(s):  
Yuzo Hisatake ◽  
Naoaki Umezu ◽  
Chiaki Kato ◽  
Yoshihiko Nakano
Keyword(s):  
Evaluation Method ◽  
Reflected Light ◽  
Allowable Level ◽  
Preliminary Study

scholarly journals Evaluation of optical fibre sensors in the electrical domain

2020 ◽  
Vol 9 (2) ◽  
pp. 199-208
Author(s):  
Ulrich Nordmeyer ◽  
Niels Neumann ◽  
Xiaozhou Wang ◽  
Dirk Plettemeier ◽  
Torsten Thiel ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Optical Fibre ◽  
Electromagnetic Interference ◽  
Evaluation Method ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Optical Fibre Sensors ◽  
Novel Approach ◽  
Reflected Light ◽  
Wide Range

Abstract. Optical fibre sensors cover a wide range of applications. They offer versatile advantages including resilience to electromagnetic interference, biocompatibility and chemical resistivity. Even in environments with restricted accessibility, integration difficulties can be overcome by using radio-over-fibre (RoF) technology that allows a wireless read-out. Conventionally, optical fibre sensors are evaluated in the optical domain by analysing the amplitude or spectrum of either the transmitted or the reflected light. A novel approach is to feed a radio frequency-modulated laser into the optical sensor and carry out a full electrical analysis of the resulting radio frequency (RF) signal, which is changed by the sensor's characteristics. This method will be investigated in this paper for fibre Bragg grating-based and chirped fibre Bragg grating-based sensors in reflection and transmission configuration. Their applicability for this new evaluation scheme will be discussed. Subsequent studies may cover additional types of sensors and the testing of the novel evaluation method within an application-related scenario, including packaging.

Preliminary Study on a New Evaluation Method of Concrete Cracking Resistant Behavior

2008 ◽  
Vol 400-402 ◽  
pp. 459-463
Author(s):  
Tao Ji ◽  
Chang Bin Hu ◽  
Yong Ning Liang
Keyword(s):  
Evaluation Method ◽  
Polypropylene Fiber ◽  
Time Span ◽  
Early Age ◽  
Cracking Behavior ◽  
Concrete Cracking ◽  
Expansive Agent ◽  
Preliminary Study ◽  
Compressive Strength Of Concrete ◽  
Restrained Ring

A restrained ring setup with a clapboard was developed. Because the clapboard can cause a stress concentration of concrete annulus placed in the ring setup, a crack of the concrete annulus can rise at the tip of the clapboard at an early age of curing. Then the time-span of the evaluation of concrete cracking behavior is shortened. The new evaluation method can avoid the disadvantages of applying the conventinal restrained ring setup without a clapboard when evaluating the cracking resistant behavior of concrete, such as the longer time-span, randomicity and chanciness of concrete cracking. Based on experimental data, in which the effect of polypropylene fiber and expansive agent on the cracking resistant behavior of concrete was investigated, the cracking age of concrete loops and the ratio of tensile strength to compressive strength of concrete were obtained, and the validity of the proposed ring setup has been verified.

scholarly journals 222Rn Exhalation Rates from Some Granite and Marble Used in Korea: Preliminary Study

Atmosphere ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1057
Author(s):  
Hyewon Lee ◽  
Jungsub Lee ◽  
Sungwon Yoon ◽  
Cheolmin Lee
Keyword(s):  
Building Materials ◽  
Evaluation Method ◽  
International Standards ◽  
Test Method ◽  
Closed Chamber ◽  
Radon Exhalation ◽  
Hazardous Chemical ◽  
Preliminary Study ◽  
Radon Exhalation Rates ◽  
International Standards Organization

The objective of this study was to establish a test method for assessing radon exhalation rates from building materials considering radon related environmental policy and research in Korea. This method was established in consideration of cost-effectiveness based on the International Standards Organization (ISO) method and the closed chamber method, which is an evaluation method for the emission of hazardous chemical substances from building materials in Korea. The assessment of radon exhalation rates from five types each of granite and marble used in the construction industry in Korea gave mean radon exhalation rates of 0.497 ± 0.467 Bq/m2∙h from granite and 0.193 ± 0.113 Bq/m2∙h from marble, indicating higher radon exhalation rates from granite. These results are consistent with those of a previous study, indicating that granites are more likely to show higher radon exhalation rates than marbles.

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